Description

Tiny Tiny RSS is an application that runs on a server and collects your rss
feeds. You may then connect to the server with a web browser or this app to
read the feeds. Don't forget to enable API access in your tt-rss account
preferences (Preferences -> Advanced -> Enable external API).

The source code specifies that the app can be used only for a trial
period, after which an app with an unlock key must be purchased from Google Play.
This dependence on nonfree software has been patched out in f-droid.org builds.